// Event btnLogin in loginform private void btnLogin_Click(object sender, EventArgs e) { // check conditition if ((!this.childForm.txtUser.Text.Split().Equals("")) && (!this.childForm.txtPass.Text.Split().Equals(""))) { //Call BUS UserBUS BUS = new UserBUS(); // CheckLogin if (BUS.CheckLogin(this.childForm.txtUser.Text, this.childForm.txtPass.Text)) { //Check ID int i = BUS.CheckLogID(this.childForm.txtUser.Text, this.childForm.txtPass.Text); //If is admin if (i == 1) { //start adminform childForm5 = new FormAdmin(this.childForm.txtUser.Text); // creat childform in parent childForm5.MdiParent = this; childForm5.Dock = DockStyle.Fill; childForm5.Show(); childForm5.btnBack.Click += BtnBack_Click; } else { //start userform childForm2 = new FormLogin(i, this.childForm.txtUser.Text); // creat childform in parent childForm2.MdiParent = this; childForm2.Dock = DockStyle.Fill; childForm2.Show(); childForm2.btnBack.Click += BtnBack_Click; } } else { MessageBox.Show("Username or Password not correct!"); } } }